Armchair



FIG. 1 is a front perspective view of an armchair showing my new design;

FIG. 2 is a front orthoscopic view thereof;

FIG. 3 is a rear orthoscopic view thereof;

FIG. 4 is a right side orthoscopic view thereof, a view from the left side being a mirror image thereof; and,

FIG. 5 is a front elevational view of the central panel of the chair back. 

The ornamental design for an armchair, as shown and described. 